CN1229618C - Interval variable electric capacity type non-contact angle displacement sensor - Google Patents
Interval variable electric capacity type non-contact angle displacement sensor Download PDFInfo
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- CN1229618C CN1229618C CN 02116326 CN02116326A CN1229618C CN 1229618 C CN1229618 C CN 1229618C CN 02116326 CN02116326 CN 02116326 CN 02116326 A CN02116326 A CN 02116326A CN 1229618 C CN1229618 C CN 1229618C
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Abstract
The present invention relates to a non-contact angular displacement sensor in a variable interval capacitance type for signal detection. The angular displacement sensor of the present invention comprises a mechanical driving mechanism and a measuring circuit; the capacitance measuring circuit of an angular conversion capacitor comprises a frequency conversion type pulse generator, a shaping emitter follower and an AND gate control part, wherein the input terminal and the earth terminal of the capacitance measuring circuit are respectively connected to a capacitance plate and a lower capacitance stator plate which are arranged in the mechanical driving mechanism through electrical wires; an upper capacitance stator plate and the lower capacitance stator plate are connected by a short circuit wire. The displacement sensor inputs a mechanical angular displacement variable from a rotary reference shaft; through the transmission of a threaded rod, interval change of capacitor plates, and input angular displacement form a linear change relationship to achieve the purpose that the variable of the input angle displacement changes the change of the capacitor capacity through mechanical transmission, and the variable signal of the angular displacement is processed by circuits to output an electric signal variable of a corresponding function. The present invention has the advantages of simple structure and high sensitivity.
Description
Technical field
The present invention relates to a kind of sensor, particularly relate to a kind of indicator signal and detect used interval variable electric capacity type non-contact angle displacement sensor.
Background technology
Former type telltale can be described as " contact-type potentiometer formula rudder displacement sensor " again.Its principle is: when the sectional area and resistivity one timing of resistive conductor, its resistance value is directly proportional with the length of resistive conductor.Added a movably mechanical stage clip brush on this resistance, by adjusting brush in ohmically position, the resistance of output changes along with the change of stage clip brush, Here it is potentiometer.The principle of work of old type rudder displacement sensor: the two ends at potentiometer add normal voltage, variation by rudder position axle angle of rotation, drive the position change of the removable stage clip brush of potentiometer, can make the variation of voltage signal of terminal output of mobile stage clip brush change along with the variation of rudder position axle angle of rotation.Potentiometer formula angular displacement sensor is exactly the situation that around this principle detects rudder displacement.It is due to the removable stage clip brush of potentiometer that this type of old type rudder displacement sensor has many defectives.Under comparatively ideal objective condition, potentiometric transducer presents that external characteristics, the volume of input and output well are small and exquisite, conciliation is flexible, simple in structure, service free.Therefore in industry among the people, potentiometer formula angular displacement sensor is widely used in a lot of fields.But because the basic mechanical attributes of stage clip brush, some distinguishingly occasion be again their weakness.As follows:
(1), easily makes the removable stage clip brush of potentiometer formula angular displacement sensor be wound, be out of shape, fracture, thereby cause the damage of sensor in the occasion of high-strength impact power.
(2) because heat engine work can form the environment than strong motion, this can be delivered to by the stage clip brush of potentiometer formula angular displacement sensor on the contact point of potentiometer resistance film than strong motion, the friction of the strong motion of stage clip brush easily makes resistive film cause the groove mark wound, causes inefficacy, damage, the signal drift of potentiometer formula angular displacement sensor, the problems such as instability of working point to take place.
(3) the stage clip brush of potentiometer formula rudder displacement sensor is two kinds of different metal materials with resistive film, forms electric pathway by contact point.Deposit having under the environment of certain humidity, these two kinds of different metal materials are easy to take place the chemical reaction of primary element on contact point, thereby produce rust spot, make the contact point electric pathway form and hinder, and influence the performance of the performance of sensor.
(4) contact point of stage clip brush and resistive film carries out the energy conversion of signal in the mechanical friction of high reps, the life-span of civilian goods is about 20,000 times, the life-span of military products is about 100,000 times, in control system at a high speed, this consumption is easy to reach, thereby make potentiometer enter emergence period of soft fault, make the instability of circuit and unreliable
Summary of the invention
The removable stage clip brush that the objective of the invention is to overcome above-mentioned existing sensor easily makes the shortcoming of the damage of sensor being wound, being out of shape, fractureing in the use for a long time; In addition, in order to overcome owing to stage clip brush and resistive film are to make of two kinds of different metal materials, form electric pathway by contact point, on contact point, be easy to the chemical reaction of primary element takes place and produce rust spot, make the contact point electric pathway form hinder, influence the shortcoming of performance of the performance of sensor; For sensitivity and the stability that improves sensor, a kind of dynamic range is big, dynamic response fast and the non-contact capacitive formula angular displacement sensor of good stability thereby provide.
The object of the present invention is achieved like this:
Non-contact capacitive formula angular displacement sensor provided by the invention, comprise: mechanical rotating mechanism and metering circuit, it is characterized in that: described mechanical rotating mechanism comprises: a base and shielding clamshell thereon, on base, have two holes, one bearing is installed in one hole, fix the axis of reference of a transmission angular displacement in this by bearing cap, bearing cap is fixed on the base with sunk screw; The leading screw end cooperates with axis of reference by a copper band that is enclosed within the axis of reference end that transmits angular displacement, and leading screw is fixed in another hole of bottom plate, and the dead eye of this hole and base is vertically opposite; The stationary shaft bottom is threaded, and in the hole of base, order is inserted in Xia Dingban, pad, lower static capacitance sheet, pad with a fixed by nut in the middle on the stationary shaft by fixed by nut, and pad is installed between bottom plate and the lower static capacitance sheet; The stationary shaft upper end is at two nut center fixed, one upper mounted plate; A hollow cylinder is protruded in the bottom surface of the opposite side of upper mounted plate, and the internal diameter of its hollow cylinder cooperates with the leading screw external diameter, and get on the bus out the internal chamber wall of a plane and hollow cylinder of leading screw lateral wall forms a narrow groove; The hollow cylinder lateral wall of the protrusion of upper mounted plate has a threaded through hole, one screw is installed in its hole, screw passes on the plane that narrow groove withstands on the leading screw outer wall, the leading screw top is hollow, and be inserted in the cavity of the hollow cylinder that protrudes the upper mounted plate bottom surface, be equipped with a spring between leading screw hollow base and the upper mounted plate; An electric capacity that forms by last capacitance sheet, lower static capacitance sheet and middle capacitance sheet; And leaving the electric capacity that the parallel installation in space forms between three, middle electric capacity moving plate, lower static capacitance sheet respectively connect a lead; Leading screw passes upper static capacitance sheet, middle electric capacity moving plate, lower static capacitance sheet, and upper and lower capacitor fixed plate is fixed on the leading screw, upper and lower capacitor fixed plate, by the short-circuit line short circuit; The metering circuit of a described angular transformation condenser capacity comprises: variable-frequency pulse generator, shaping emitter follower and control and door section circuit, its metering circuit input end and earth terminal by electric wire and be connected respectively to above-mentioned on electric capacity moving plate and the lower static capacitance sheet.
Described variable-frequency pulse generator partly comprises: operational amplifier G
1, resistance R
4, resistance R
3Hysteresis comparator and a resistance-capacitance circuit of forming, wherein capacitor C comprises angular displacement conversion capacitor C
x, promptly above-mentioned upper static capacitance sheet, capacitor and input offset capacitor C that middle electric capacity moving plate and lower static capacitance sheet form
1, capacitor C
1Be used for offset angle shift transformation capacitor C
xEdge effect to the influence of output frequency F.R
3Be connected operational amplifier G
1Positive input and output between, resistance R
4Be connected operational amplifier G
1Reverse input end and output between, resistance R
4Be connected operational amplifier G
1Power input and output terminal between; Between the positive input of operational amplifier and power input, also connect resistance R
1, the resistance of R is R
1, R
2And R
3Resistance in parallel.This variable-frequency pulse generator produces electric pulse, its pulsed frequency F changes along with the variation of the electric capacity of capacitor C, thereby measurement pulsed frequency F just can obtain electric capacity, owing to the angular displacement of electric capacity along with axis of reference (screw rod) changes, so the variation of survey frequency F just can obtain the angular displacement of axis of reference.
Described shaping emitter follower part is by voltage stabilizer that comprises three terminal regulator 7805 and triode G
2, resistance R
7And resistance R
6, the output that is used to guarantee variable-frequency pulse generator has enough load capacity and makes the output impulse level and the load compatibility of variable-frequency pulse generator.R wherein
7Be connected the output terminal and the triode G of operational amplifier
2Emitter between, capacitor C
2, resistance R
5And resistance R
6Constitute the triode G of shaping emitter follower
2Differential biasing bleeder circuit, this circuit make the active device of shaping emitter follower only be operated in saturated or end two kinds of duties, so that shaping is carried out in the output pulse.Capacitor C
2And resistance R
5Be connected on operational amplifier G
1Output terminal and triode G
2Base stage between, resistance R
6Be connected triode G
2Collector and base stage between.Output (+5V) three terminal regulator (7805) makes output impulse level and TTL (transistor-transistor logic) circuit load compatibility.Capacitor C
2Play stopping direct current.
Described control AND circuit is by diode D
1, D
2And resistance R
8Separating component constitutes.Be used for output, so that the paired pulses frequency is measured by counting control control end A pulse.When A end for high level (+5V) time, open output terminal O, make the output of digit pulse string.Diode D wherein
1Be connected triode G
2Emitter and the output terminal of circuit between.Diode D
2Be connected between the output terminal and A end of circuit.R
8Be connected between the output terminal of the output terminal of stabilized voltage supply and circuit.When the A end is low level (0V), close output terminal O and calculate pulsed frequency F according to the umber of pulse that records in the certain hour, relation according to frequency F and angular transformation condenser capacity obtains the angular transformation condenser capacity again, tries to achieve angle displacement according to the variation of this electric capacity again.So just finished the work of contactless angular displacement sensor.The advantage of mode digital serial output type circuit is that circuit is simple, low cost.
Interval variable electric capacity type non-contact angle displacement sensor of the present invention is made up of mechanical hook-up and parts such as oscillation inverter circuit and several shaping treatment circuits that noncontact becomes the space type capacitor assembly.This displacement transducer is to import mechanical angular displacement variable from rotating reference shaft, make the relation of variation and the linear variation of input angular displacement of condenser plate spacing through the transmission of mechanical whorl bar, the variable that reaches input angular displacement changes the purpose that condenser capacity changes by mechanical transfer, capacitor constitutes electrical signal processing system with corresponding circuit, and the variable signal of angular displacement is exported the electric signal variable of respective function after the processing of circuit.
The invention has the advantages that:
(1) dynamic range is big
The said dynamic range of the present invention is with transducer input maximal value of non electrical quantity and recently measuring of minimum value.This ratio is 1% for metal strain plate; For semiconductor gauge is 20%; Can be for capacitive transducer greater than 100%.
(2) dynamic response is fast
Because the quality of capacitive transducer moving part is less, so natural frequency is very high, can be operated in the scope of several megahertzes, therefore wider frequency is arranged.
(3) highly sensitive
Application rate formula transformer can be surveyed 10 of capacitance
-7Variable quantity.
(4) the self-heating influence is little
Because capacitive transducer adopts vacuum, air, perhaps other gas is as insulating medium, and the loss of medium is smaller.Therefore, the heat generation rate of sensor itself can be ignored.
(5) good stability
Reasonably select material, the temperature coefficient of sensitivity can be at 1*10
-6C
0Below.
(6) non-contact measurement
(7) simple in structure, adaptability is strong: capacitive transducer adopts inorganic material more, and with there being metal to make electrode, so simple in structure, that can do is very little, so that carry out some special measurement.Because this sensor do not have special organic material and magnetic material, therefore, it is bigger or have in the rugged environment of various radiation to be operated in temperature variation.
Description of drawings
Fig. 1 contactless angular displacement mechanical structure sectional view of the present invention
Fig. 2 mode digital serial output type circuit theory diagrams
The working waveform figure of Fig. 3 numeric string line output circuit
Drawing is described as follows:
1-stationary shaft 2-nut 3-upper mounted plate 4-spring
5-screw 6-leading screw 7-nut 8-upper static capacitance sheet
Electric capacity moving plate 10-lower static capacitance sheet 11-bottom plate among the 9-
12-copper band 13-sunk screw 14-bearing
15-axis of reference 16-bearing cap 17-lower gasket 18-Upper gasket
19-base 20-short-circuit line 21,22-electric wire 23-cavity
The narrow groove 25-shielding of 24-clamshell 26-plane
Embodiment
The non-contact capacitive formula angular displacement sensor mechanical part of present embodiment is pressed Fig. 1 and is made, and circuit part is pressed Fig. 2 and made.This sensor comprises: an axis of reference 15 that is used to transmit the angular displacement mechanical quantity, axis of reference 15 is designed to standard closely-pitched screw rod in radome 25, cooperating the physical construction of axis of reference 15 is leading screw 6, and when screw rod rotated for 1 week (360 degree), moving axially of leading screw was 3mm; When screw rod rotated 5 weeks (5*360 degree), moving axially of leading screw was 15mm.Have a hole on the another side of base 19, a bearing 14 is installed in the hole, fix the axis of reference 15 of a transmission angular displacement by bearing cap 16 in this, bearing cap 16 usefulness sunk screws are fixed on the base 19; Leading screw 6 ends cooperate with axis of reference 15 by a copper band that is enclosed within axis of reference 15 ends that transmit angular displacement, and leading screw 6 is fixed in another hole of bottom plate 11, and bearing 14 holes of this hole and base 9 are vertically opposite; Wherein shielding case is made up of base 19 and clamshell 25, on base 19, have one and be used for fixing axle 1 hole that penetrates, stationary shaft 1 bottom is threaded, by fixed by nut in the hole of base 19, order is inserted in bottom plate 11, lower gasket 17 lower static capacitance sheets 10, Upper gasket 18 usefulness one fixed by nut in the middle on the stationary shaft 1, and lower gasket 17 is installed between bottom plate 11 and the lower static capacitance sheet 10; Lower gasket 17 is used to regulate the distance of lower static capacitance sheet 10 and bottom plate 11.Upper gasket 18 is installed between upper static capacitance sheet 9 and the lower static capacitance sheet 10, and Upper gasket 18 is used to regulate the distance between upper static capacitance sheet and the lower static capacitance sheet.Stationary shaft 1 upper end is at two nuts, 2 center fixed, one upper mounted plate 3; A hollow cylinder is protruded in the bottom surface of the opposite side of upper mounted plate 3, and the internal diameter of its hollow cylinder cooperates with leading screw 6 external diameters, and silk is shouldered get on the bus out the internal chamber wall of a plane 26 and hollow cylinder of 6 lateral walls and formed a narrow groove 24; The hollow cylinder lateral wall of the protrusion of upper mounted plate 3 has a threaded through hole, and a screw 5 is installed in its hole, and screw 5 passes on the plane that narrow groove 24 withstands on the leading screw outer wall 26, and he is used to lead and limit moving of leading screw.Copper band 12 is used to strengthen the threaded engagement intensity of 15 of leading screw and axis of reference.One by upper static capacitance sheet 8, lower static capacitance sheet 10 and middle electric capacity moving plate 9, and leaves the electric capacity that the parallel installation in space forms between three, leading screw 6 is that nonmetallic materials are made, and makes upper static capacitance sheet 8 and middle electric capacity moving plate 9 become electrical isolation.Leading screw 6 passes upper static capacitance sheet 8, middle electric capacity moving plate 9, lower static capacitance sheet 10, and upper and lower capacitor fixed plate is fixed on the leading screw 6, and upper and lower capacitor fixed plate 8,10 is by short-circuit line 20 short circuits, and it is in order to compensate the edge capacitance effect that upper static capacitance sheet is set.Leading screw 6 tops are hollow, and are inserted in the cavity 23 of the hollow cylinder that protrudes upper mounted plate 3 bottom surfaces, are equipped with a spring 4 between leading screw 6 hollow base and the upper mounted plate 3; The screw thread that is used to make leading screw is the screw thread of roof pressure axis of reference all the time, when eliminating leading screw break-in moved up and down because the displacement error that tolerance clearance was produced between rib-loop.
When axis of reference rotates, the driving leading screw moves, electric capacity moving plate moving in the mobile drive of leading screw relative to upper static capacitance sheet and lower static capacitance sheet, the distance of the relative lower static capacitance sheet of electric capacity moving plate in the change, thereby change the electric capacity of capacitor, so just realized the conversion from the angular displacement to the electric capacitance change.
When axis of reference (screw rod) 15 rotates, leading screw 6 moves in above-mentioned hole vertically, and drive upper static capacitance sheet 8 and middle electric capacity moving plate 9 is mobile, so just changed the distance between middle electric capacity moving plate 9 and the lower static capacitance sheet 10, thereby electric capacity moving plate 9 and the formed electric capacity of lower static capacitance sheet in changing, the variable quantity of measuring electric capacity just can obtain the displacement of angle.So the change amount of the angular displacement of axis of reference 15 and electric capacity has just connected.Upper static capacitance sheet is used for the edge capacity effect of compensation condenser and reinforces electric capacity moving plate 9.
Circuit part is used to measure the electric capacity of above-mentioned angular displacement conversion capacitor, and the schematic diagram of this circuit is illustrated among Fig. 2, and it is the mode digital serial output type circuit, comprising: variable-frequency pulse generator, shaping emitter follower and control AND circuit; The input end of circuit and earth terminal are connected respectively on above-mentioned middle electric capacity moving plate 9 and lower static capacitance sheet 10 or above-mentioned middle electric capacity moving plate 9 and the upper static capacitance sheet 8 by input lead 21,22.
Described variable-frequency pulse generator comprises: operational amplifier G
1, resistance R
1, resistance R
3Hysteresis comparator and a resistance-capacitance circuit of forming, wherein capacitor C comprises angular displacement conversion capacitor C
x, promptly above-mentioned upper static capacitance sheet 8, capacitor and input offset capacitor C that middle electric capacity moving plate 9 and lower static capacitance sheet 10 form
1, C
1Be used for offset angle shift transformation capacitor C
xEdge effect to the influence of output frequency F.R
3Be connected operational amplifier G
1Positive input and output between, R
4Be connected operational amplifier G
1Reverse input end and output terminal between, R
4Be connected operational amplifier G
1Power input and output terminal between; Between the positive input of operational amplifier and power input, also connect resistance R
1, the resistance of R is R
1, R
2And R
3Resistance in parallel.Variable-frequency pulse generator produces electric pulse, its pulsed frequency F changes along with the variation of the electric capacity of capacitor C, thereby measurement pulsed frequency F just can obtain electric capacity, owing to the angular displacement of electric capacity along with axis of reference (screw rod) 15 changes, so the variation of survey frequency F just can obtain the angular displacement of axis of reference 15.Fig. 3 represents the relation of frequency F and angle.
Described shaping emitter follower is by voltage stabilizer that comprises three terminal regulator 7805 and triode G
2, resistance R
7And resistance R
6, the output that is used to guarantee variable-frequency pulse generator has enough load capacity and makes the output impulse level and the load compatibility of variable-frequency pulse generator.R wherein
7Be connected the output terminal and the triode G of operational amplifier
2Emitter between, capacitor C
2, resistance R
5And resistance R
6Constitute the triode G of shaping emitter follower
2Differential biasing bleeder circuit, this circuit make the active device of shaping emitter follower only be operated in saturated or end two kinds of duties, so that shaping is carried out in the output pulse.C
2And R
5Be connected on operational amplifier G
1Output terminal and triode G
2Base stage between, resistance R
6Be connected triode G
2Collector and base stage between.Output (+5V) three terminal regulator (7805) makes output impulse level and TTL (transistor-transistor logic) circuit load compatibility.C
2Play stopping direct current.
Described control AND circuit is by diode D
1, D
2And resistance R
8Separating component constitutes, wherein diode D
1Be connected triode G
2Emitter and the output terminal of circuit between.Diode D
2Be connected between the output terminal and A end of circuit.Resistance R
8Be connected between the output terminal of the output terminal of stabilized voltage supply and circuit.This circuit is used for the output by A end gating pulse, so that the paired pulses frequency is measured.When A end for high level (+5V) time, open output terminal O, make the output of digit pulse string.When the A end is low level (0V), close output terminal O and calculate pulsed frequency F according to the umber of pulse that records in the certain hour, relation according to frequency F and angular transformation condenser capacity obtains the angular transformation condenser capacity again, tries to achieve angle displacement according to the variation of this electric capacity again.So just finished the work of contactless angular displacement sensor.The advantage of mode digital serial output type circuit is that circuit is simple, low cost.
The non-contact capacitive formula angular displacement sensor that present embodiment is made has following characteristic:
(1) input range of angular displacement is: 0 °＜θ＜1440 °;
(2) output level of mode digital serial output type regulation: 0V～5V;
(3) the mode digital serial output type input voltage range is :+7V～+ 30V;
(6) the transducer series response time is less than 10ms;
(7) sensor has good Electro Magnetic Compatibility.
Claims (6)
1. interval variable electric capacity type non-contact angle displacement sensor, comprise: the metering circuit of mechanical transmission structure and angular transformation capacitance, it is characterized in that: described mechanical transmission structure comprises: a base (19) and shielding clamshell (25) thereon, on base (19), have two holes, one bearing (14) is installed in one hole, fix the axis of reference (15) of a transmission angular displacement in this axle by bearing cap (16), bearing cap (16) is fixed on the base (19) with countersunk head screw; Leading screw (6) is terminal to be cooperated with axis of reference (15) by a copper band that is enclosed within axis of reference (15) end that transmits angular displacement, and leading screw (6) is fixed on down in the hole of fixing version (11), and bearing (14) hole of this hole and base (19) is vertically opposite; Stationary shaft (1) bottom is threaded, by fixed by nut in another hole of base (19), stationary shaft (1) is gone up order and is inserted in bottom plate (11), lower gasket (17), lower static capacitance sheet (10) Upper gasket (18) with a fixed by nut in the middle, and lower gasket (17) is installed between bottom plate (11) and the lower static capacitance sheet (10); Stationary shaft (1) upper end is at two nuts (2) center fixed one upper mounted plates (3); A hollow cylinder is protruded in the bottom surface of leading screw (6) one sides of upper mounted plate (3), and the internal diameter of its hollow cylinder cooperates with leading screw (6) external diameter, and silk is shouldered get on the bus out the internal chamber wall of a plane (26) and hollow cylinder of (6) lateral wall and formed a narrow groove (24); The outstanding hollow cylinder lateral wall of upper mounted plate (3) has a threaded through hole, one screw (5) is installed in its hole, screw (5) passes on the plane that narrow groove (24) withstands on the leading screw outer wall (26), leading screw (6) top is hollow, and be inserted in the cavity (23) of the hollow cylinder that protrudes upper mounted plate (3) bottom surface, be equipped with a spring (4) between leading screw (6) hollow base and the upper mounted plate (3); One by upper static capacitance sheet (8), lower static capacitance sheet (10) and middle electric capacity moving plate (9), and leaves the electric capacity that the parallel installation in space forms between three; Middle electric capacity moving plate (9), lower static capacitance sheet (10) respectively connect a lead (21) (22); Leading screw (6) passes upper static capacitance sheet (8), middle electric capacity moving plate (9), lower static capacitance sheet (10), and upper static capacitance sheet (8) and lower static capacitance sheet (10) are fixed on the leading screw (6), and upper and lower capacitor fixed plate (8), (10) connect by a short-circuit line (20); The metering circuit of a described angular transformation condenser capacity comprises: variable-frequency pulse generator, shaping emitter follower and control AND circuit, its metering circuit input end and earth terminal are connected respectively on above-mentioned middle electric capacity moving plate (9) and the lower static capacitance sheet (10) by lead (21) (22).
2. by the described interval variable electric capacity type non-contact angle displacement sensor of claim 1, it is characterized in that: described axis of reference (15) is standard closely-pitched screw rod in shielding clamshell (25).
3. by the described interval variable electric capacity type non-contact angle displacement sensor of claim 1, it is characterized in that: described variable-frequency pulse generator partly comprises: operational amplifier G
1, resistance R
4, resistance R
3Hysteresis comparator and a resistance-capacitance circuit of forming, wherein capacitor C comprises angular displacement conversion capacitor C
x, be above-mentioned upper static capacitance sheet (8) capacitor and input offset capacitor C that middle electric capacity moving plate (9) and lower static capacitance sheet (10) form
1, C
1Be used for offset angle shift transformation capacitor C
xEdge effect to the influence of output frequency F; Resistance R
3Be connected operational amplifier G
1Positive input and output between, resistance R
4Be connected operational amplifier G
1Reverse input end and output terminal between, resistance R
4Be connected operational amplifier G
1Power input and output terminal between; Between the positive input of operational amplifier and power input, also connect resistance R
1, the resistance of resistance R is R
1, R
2And R
3Resistance in parallel.
4. by the described interval variable electric capacity type non-contact angle displacement sensor of claim 3, it is characterized in that: shaping emitter follower part is by voltage stabilizer that comprises three terminal regulator 7805 and triode G
2, resistance R
7And resistance R
6, R wherein
7Be connected the output terminal and the triode G of three terminal regulator 7805
2Emitter between, capacitor C
2, resistance R
5And resistance R
6Constitute the triode G of shaping emitter follower
2Differential biasing bleeder circuit, this circuit make the active device of shaping emitter follower only be operated in saturated or end two kinds of duties, so that shaping is carried out in the output pulse; Capacitor C
2And resistance R
5Be connected on operational amplifier G
1Output terminal and triode G
2Base stage between, resistance R
6Be connected triode G
2Collector and base stage between; Output three terminal regulator 7805 makes output impulse level and transistor-transistor logic circuit load compatibility; Capacitor C
2Play stopping direct current.
5. by the described interval variable electric capacity type non-contact angle displacement sensor of claim 4, it is characterized in that: described control AND circuit is by diode D
1, D
2And resistance R
8Separating component constitutes; When counting control end (A) when be high level+5V, open output terminal 0, the digit pulse string is exported; Diode D wherein
1Be connected triode G
2Emitter and the output terminal of circuit between; Diode D
2Be connected between the output terminal and counting control end (A) of circuit; Resistance R
8Be connected between the output terminal of the output terminal of three terminal regulator 7805 and circuit; When counting control end (A) is low level 0V, close output terminal 0 and calculate pulsed frequency F according to the umber of pulse that records in the certain hour, relation according to frequency F and angular transformation condenser capacity obtains the angular transformation condenser capacity again, tries to achieve angle displacement according to the variation of this electric capacity again.
6. by the described interval variable electric capacity type non-contact angle displacement sensor of claim 4, it is characterized in that: described output three terminal regulator 7805 is output+5V three terminal regulators 7805.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02116326 CN1229618C (en) | 2001-12-30 | 2002-03-26 | Interval variable electric capacity type non-contact angle displacement sensor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01145137.8 | 2001-12-30 | ||
| CN01145137 | 2001-12-30 | ||
| CN 02116326 CN1229618C (en) | 2001-12-30 | 2002-03-26 | Interval variable electric capacity type non-contact angle displacement sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1430042A CN1430042A (en) | 2003-07-16 |
| CN1229618C true CN1229618C (en) | 2005-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02116326 Expired - Fee Related CN1229618C (en) | 2001-12-30 | 2002-03-26 | Interval variable electric capacity type non-contact angle displacement sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535625A (en) * | 2015-01-30 | 2015-04-22 | 中国科学院测量与地球物理研究所 | Capacitance sensing probe and precise spring shift-measurement instrument |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102023799B1 (en) * | 2012-10-05 | 2019-09-20 | 시케이디 가부시키가이샤 | Capacitive displacement sensor |
| US8941392B1 (en) * | 2013-08-17 | 2015-01-27 | Bend Labs, Inc. | Angular displacement sensor of compliant material |
| CN111900685B (en) * | 2020-07-15 | 2021-07-06 | 扬州市华宇电器设备有限公司 | Bus duct device with intelligent temperature and humidity monitoring function and using method thereof |
| CN112504114B (en) * | 2021-02-03 | 2021-04-27 | 成都宏明电子股份有限公司 | Miniature dual-redundancy angular displacement sensor with rotation angle limiting function |
-
2002
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535625A (en) * | 2015-01-30 | 2015-04-22 | 中国科学院测量与地球物理研究所 | Capacitance sensing probe and precise spring shift-measurement instrument |
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| CN1430042A (en) | 2003-07-16 |
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